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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2019 and December 31, 2018 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,794.5 |  |  | $ | 29.6 |  |  | $ | — |  |  | $ | 2,824.1 |
United Kingdom |  |  | 784.2 |  |  |  | 9.6 |  |  |  | — |  |  |  | 793.8 |
Canada |  |  | 437.4 |  |  |  | — |  |  |  | — |  |  |  | 437.4 |
Australia |  |  | 409.2 |  |  |  | 0.3 |  |  |  | — |  |  |  | 409.5 |
New Zealand |  |  | 213.3 |  |  |  | 10.3 |  |  |  | — |  |  |  | 223.6 |
Other foreign |  |  | 109.8 |  |  |  | — |  |  |  | 2.7 |  |  |  | 112.5 |
Total goodwill |  | $ | 4,748.4 |  |  | $ | 49.8 |  |  | $ | 2.7 |  |  | $ | 4,800.9 |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,715.3 |  |  | $ | 29.6 |  |  | $ | — |  |  | $ | 2,744.9 |
United Kingdom |  |  | 753.7 |  |  |  | 9.2 |  |  |  | — |  |  |  | 762.9 |
Canada |  |  | 378.6 |  |  |  | — |  |  |  | — |  |  |  | 378.6 |
Australia |  |  | 406.3 |  |  |  | 0.3 |  |  |  | — |  |  |  | 406.6 |
New Zealand |  |  | 209.6 |  |  |  | 10.2 |  |  |  | — |  |  |  | 219.8 |
Other foreign |  |  | 110.1 |  |  |  | — |  |  |  | 2.7 |  |  |  | 112.8 |
Total goodwill |  | $ | 4,573.6 |  |  | $ | 49.3 |  |  | $ | 2.7 |  |  | $ | 4,625.6 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 2019 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2018 |  | $ | 4,573.6 |  |  | $ | 49.3 |  |  | $ | 2.7 |  |  | $ | 4,625.6 |
Goodwill acquired during the period |  |  | 131.5 |  |  |  | — |  |  |  | — |  |  |  | 131.5 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 8.4 |  |  |  | — |  |  |  | — |  |  |  | 8.4 |
Goodwill written-off related to sales of business |  |  | (6.6 | ) |  |  | — |  |  |  | — |  |  |  | (6.6 | )
Foreign currency translation adjustments during the period |  |  | 41.5 |  |  |  | 0.5 |  |  |  | — |  |  |  | 42.0 |
Balance as of March 31, 2019 |  | $ | 4,748.4 |  |  | $ | 49.8 |  |  | $ | 2.7 |  |  | $ | 4,800.9 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2019 and December 31, 2018 consist of the following (in millions):
|  | March 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Expiration lists |  | $ | 3,529.6 |  |  | $ | 3,379.4 |
Accumulated amortization - expiration lists |  |  | (1,758.8 | ) |  |  | (1,676.8 | )
|  |  | 1,770.8 |  |  |  | 1,702.6 |
Non-compete agreements |  |  | 60.7 |  |  |  | 58.0 |
Accumulated amortization - non-compete agreements |  |  | (49.8 | ) |  |  | (48.5 | )
|  |  | 10.9 |  |  |  | 9.5 |
Trade names |  |  | 86.4 |  |  |  | 86.0 |
Accumulated amortization - trade names |  |  | (26.7 | ) |  |  | (25.1 | )
|  |  | 59.7 |  |  |  | 60.9 |
Net amortizable assets |  | $ | 1,841.4 |  |  | $ | 1,773.0 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2019 (remaining nine months) |  | $ | 226.3 |
2020 |  |  | 286.7 |
2021 |  |  | 262.8 |
2022 |  |  | 237.5 |
2023 |  |  | 213.5 |
Thereafter |  |  | 614.6 |
Total |  | $ | 1,841.4 |

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